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首页> 外文期刊>Power Electronics, IET >Source switching circuit with low-gate-driving loss in high-voltage buck light emitting diode driver
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Source switching circuit with low-gate-driving loss in high-voltage buck light emitting diode driver

机译：高压降压型发光二极管驱动器中具有低栅极驱动损耗的源极开关电路

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摘要

Source switching circuit with low-gate-driving loss in high-voltage buck light emitting diode (LED) driver is proposed in this study. Source switching circuit comprises of a high-voltage power metal-oxide semiconductor field-effect transistor (MOSFET) (HVMOS) and a low-voltage power MOSFET (LVMOS) in series, a capacitor and a Zener diode. By switching the HVMOS by different source voltage and constant gate voltage, it recycles gate charges of HVMOS to reduce gate-driving loss. Gate charges are recycled in the capacitor when LVMOS is turning off, and can be reused when LVMOS is turning on. This circuit also provides a new power feeding route for control chip, and power consumption is relatively low on the proposed route. The power feeding route also improves power efficiency. With a 12 W LED load, the experiment shows that the efficiency of the proposed driving circuit is improved by 3.7% with 156 V input voltage and 4.8% with 326 V input voltage compared with the converter using single HVMOS.
机译：提出了一种在高电压降压发光二极管（LED）驱动器中具有低栅极驱动损耗的源极开关电路。源极开关电路包括串联的高压功率金属氧化物半导体场效应晶体管（MOSFET）（HVMOS）和低压功率MOSFET（LVMOS），电容器和齐纳二极管。通过用不同的源极电压和恒定的栅极电压切换HVMOS，它可以回收HVMOS的栅极电荷以减少栅极驱动损耗。栅极电压在LVMOS关闭时在电容器中回收，并且在LVMOS开启时可以重复使用。该电路还为控制芯片提供了一条新的供电路径，并且在所建议的路径上功耗相对较低。供电路径也提高了功率效率。在12 W LED负载下，实验表明，与使用单个HVMOS的转换器相比，所建议的驱动电路的效率在156 V输入电压下提高了3.7％，在326 V输入电压下提高了4.8％。

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